diff --git a/README.md b/README.md
index 8266a9b..25bc63c 100644
--- a/README.md
+++ b/README.md
@@ -167,5 +167,5 @@ Main author: [Achim D. Brucker](http://www.brucker.ch/)
 
 ## License
 If not otherwise stated, all sub-projects are dual-licensed under a
-2-clause BSD-style license and/or the LPPL version 1 or any later 
-version.
+2-clause BSD-style license and/or the LPPL version 1.3c or (at your 
+opinion) any later version.
diff --git a/authorarchive.sty b/authorarchive.sty
index ab3a2ca..230d8b1 100644
--- a/authorarchive.sty
+++ b/authorarchive.sty
@@ -4,11 +4,11 @@
 %%   This program can be redistributed and/or modified under the terms
 %%   of the LaTeX Project Public License Distributed from CTAN
 %%   archives in directory macros/latex/base/lppl.txt; either
-%%   version 1 of the License, or any later version.
+%%   version 1.3c of the License, or (at your option) any later version.
 %%   OR
 %%   The 2-clause BSD-style license.
 %%
-%%   SPDX-License-Identifier: LPPL-1.0+ OR BSD-2-Clause
+%%   SPDX-License-Identifier: LPPL-1.3c+ OR BSD-2-Clause
 \NeedsTeXFormat{LaTeX2e}\relax
 \ProvidesPackage{authorarchive}
   [0000/00/00 Unreleased v1.0.0+%